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Legacy applications are often maintained solely to provide infrequent or sporadic access to data within the application database for regulatory or business purposes. With some organizations spending upwards of 75% of their application software budgets on ongoing maintenance, [2] application retirement can deliver significant cost savings.
However, the process's entry in the process table remains. The parent can read the child's exit status by executing the wait system call , whereupon the zombie is removed. The wait call may be executed in sequential code, but it is commonly executed in a handler for the SIGCHLD signal , which the parent receives whenever a child has died.
Process management Optional (UP) Run jobs in the foreground file: Filesystem Mandatory Determine file type Version 4 AT&T UNIX find: Filesystem Mandatory Find files Version 1 AT&T UNIX fold: Text processing Mandatory Filter for folding lines 1BSD fuser: Process management Optional (XSI) List process IDs of all processes that have one or more ...
A server process is also said to be orphaned when the client that initiated the request unexpectedly crashes after making the request while leaving the server process running. These orphaned processes waste server resources and can potentially leave a server starved for resources. However, there are several solutions to the orphan process problem:
Legacy systems are considered to be potentially problematic by some software engineers for several reasons. [4]If legacy software runs on only antiquated hardware, the cost of maintaining the system may eventually outweigh the cost of replacing both the software and hardware unless some form of emulation or backward compatibility allows the software to run on new hardware.
A single process, the session leader, interacts with the controlling terminal in order to ensure that all programs are terminated when a user "hangs up" the terminal connection. (Where a session leader is absent, the processes in the terminal's foreground process group are expected to handle hangups.)
Process isolation can be implemented with virtual address space, where process A's address space is different from process B's address space – preventing A from writing onto B. Security is easier to enforce by disallowing inter-process memory access, in contrast with less secure architectures such as DOS in which any process can write to any ...
However, on others such as IRIX, Linux, and FreeBSD, an argument is supplied specifying the name of the process (or processes) to kill. For instance, to kill a process such as an instance of the XMMS music player invoked by xmms , the user would run the command killall xmms .